/**
*      author: Y_Yao
*      created: 2025-02-22 20:00:48
**/

#include<bits/stdc++.h>

#define int LL
using namespace std;
using LL = long long;
const LL LLINF = 1e18;
const int INF = 0x3f3f3f3f;
string s;

void solve()
{
    cin >> s;
    int cnt = 0;
    for(int i = 0;i <s.size();i++)
    {
        if(s[i] == '2') cnt++;
    }
    while(cnt--)
    {
        cout << 2;
    }
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int t = 1;
    //cin >> t;
    while(t--)
    {
        solve();
    }
    return 0;
}